Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/35329
Type: Artigo de periódico
Title: A fault location method using Lamb waves and discrete wavelet transform
Author: Souza, Pablo Rodrigo de
Nobrega, Eurípedes Guilherme de Oliveira
Abstract: Non-destructive evaluation methods and signal process techniques are important steps in structural health monitoring systems to assess the structure integrity. This paper presents a method for fault location in aluminum beams based on time of flight of Lamb waves. The dynamic response signal captured from the structure was processed using the discrete wavelet transform. The information accuracy obtained from the processed signal depends on the correct choice of the mother wavelet. The best mother wavelet was selected using the Shannon's entropy criterion. Numerical results for a damage localized in different positions are presented using the spectral finite element method, and an experimental setup was used to assess the accuracy of the method. The results showed that the combination of the non-destructive evaluation technique based on Lamb waves with the discrete wavelet transform is effective in detecting and locating faults in aluminum beams whose results had errors less than 1%.
Subject: structural health monitoring
fault detection and localization
Lamb waves
discrete wavelet transform
spectral finite element method
Editor: Associação Brasileira de Engenharia e Ciências Mecânicas - ABCM
Rights: aberto
Identifier DOI: 10.1590/S1678-58782012000400013
Address: http://dx.doi.org/10.1590/S1678-58782012000400013
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-58782012000400013
Date Issue: 1-Dec-2012
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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